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A model to predict phase equilibrium of CH (sub 4) and CO (sub 2) clathrate hydrate in aqueous electrolyte solutions

Duan Zhenhao and Sun Rui
A model to predict phase equilibrium of CH (sub 4) and CO (sub 2) clathrate hydrate in aqueous electrolyte solutions
American Mineralogist (August 2006) 91 (8-9): 1346-1354

Abstract

A thermodynamic model to predict phase equilibrium of methane and carbon dioxide hydrate in aqueous electrolyte solutions is presented. Using the Pitzer model to account for the variation of water activity due to electrolytes and dissolved gas in aqueous solutions, we extended the model based on ab initio molecular potential developed recently by us for the CH (sub 4) -H (sub 2) O and CO (sub 2) -H (sub 2) O binary systems to the CH (sub 4) (or CO (sub 2) )-H (sub 2) O-salts system. Comparison of the model with extensive experimental data indicates that this model can accurately predict the phase equilibrium of CH (sub 4) hydrate and CO (sub 2) hydrate in various electrolyte solutions (such as aqueous NaCl, KCl, CaCl (sub 2) , NaCl + KCl, NaCl + CaCl (sub 2) solutions, and seawater) from zero to high ionic strength (about 6 m) and from low to high pressures.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 91
Serial Issue: 8-9
Title: A model to predict phase equilibrium of CH (sub 4) and CO (sub 2) clathrate hydrate in aqueous electrolyte solutions
Author(s): Duan ZhenhaoSun Rui
Affiliation: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
Pages: 1346-1354
Published: 200608
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 58
Accession Number: 2006-079768
Categories: General geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 5 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200645
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